Things change. I had people asking why I had so much trouble with this one boss, cause they didn't find it difficult at all.
Then they took another character through after the update. That boss wasn't quite so easy; faster regen, faster movement, and two aoe attacks that it didn't have before.
I've seen quests change, and the text i was reading did not match what the quest giver was saying. The players who aren't interested in the story probably won't notice, but the players who are interested in the story will.